Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 18 of 18 for “"Aerial survey"”.
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Characterizing African Elephant (<i>Loxodonta Africana</i>) Population Dynamics and Distribution in Botswana
… by government and independent researchers (from aerial survey data) differ and continue to be highly debated, both locally and internationally. To add more clarity and potentially resolve this ongoing debate, this study evaluates aerial survey data collected by the Botswana government from 1990 …
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Wind shear and differential upwelling along the South Western tip of Africa
… and meteorological investigations. Mesoscale aerial survey case studies form the observational basis from which the spatial variations in winds and upwelling are compared. Coastal winds, controlled by the pressure gradient between the South Atlantic Anticyclone and a summertime interior low, …
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An Aerial Investigation and Mapping Project in Southern Holderness: An Evolving Wetland Landscape
… sites were identified through targeted aerial reconnaissance in Holderness, East Yorkshire. The aerial reconnaissance flights were conducted by the author of this project, who works in the Aerial Survey team at Historic England. The new archaeological sites were identified as cropmarks, …
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Movement and behavior of ocean sunfish, Mola mola, in the northwest Atlantic
… archival tags (PSAT's). In addition, analysis of aerial survey data was conducted to determine the distribution of ocean sunfish (Family Molidae) in NW Atlantic shelf waters. Data was analyzed from twenty-five PSAT's deployed on M. mola in the northwest Atlantic between 2005 and 2008. Tags were …
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An Assessment of Habitat Suitability for Pronghorn Populations of the Central Valley Region of California
… improve upon previous models for the CPNM using aerial survey data and then apply the model to the Tejon Ranch. Aerial survey data collected from 2000-2010 on the CPNM was used to establish “use” and “non-use” areas in the model. Model variables included vegetation type (forest, shrub, grassland, …
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A Hybrid Neural Network Architecture for Texture Analysis in Digital Image Processing Applications
… results, and mathematical analysis when using aerial survey images. Other novel approaches using the hybrid neural network are presented with concluding comments outlining the findings presented within this thesis.
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New insights into the summer distribution of basking sharks (Cetorhinus maximus) in the northeast Atlantic
… on basking sharks was derived from three aerial survey programmes which covered extensive inshore and offshore waters within the northeast Atlantic. The occurrence of basking sharks in the area was highly seasonal, with individuals predominately observed during the summer months …
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Characterizing methane emissions on oil and gas sites
… first reconciles top-down measurements from an aerial survey-based technology with bottom-up inventories that are designed to represent long-term emission volumes. The second compares different point sensor networks and isolates differences in the sensor platform (i.e., sensor type and …
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Quantifying groundwater discharge using thermal imagery and conventional groundwater exploration techniques for estimating the nitrogen loading to a meso-scale inland estuary
… these variables, examined by a thermal infrared aerial survey in the spring of 2000, and water quality, specific discharge, and piezometric surface maps in the summer of 2001. Monitoring wells upgradient of the Great Bay were analyzed for nitrogen as an indicator of potential discharge source …
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Management of a central Illinois deer herd
… densities by both visual and infrared helicopter surveys. The 600 hectare park had been closed to hunting until 2004 when a total of 730 deer were counted on the entire survey area (the park and the surrounding 2,953 ha). The deer management program (2004-2010) utilized archery and shotgun hunting …
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Assessing the distribution and vulnerability of a seabird community at sea to inform conservation and management
… a cost-effective alternative to large-scale surveys or complex modelling approaches. I calculate the percentage population coverage from current marine and coastal protected areas (MPAs) for all seabird species using foraging radius distributions. On average, 33% of coastal populations and …
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The Ecology of Large Marine Predators in the Hauraki Gulf
… eden brydei. Double-observer line transect aerial surveys were conducted in the Gulf from November 2013 to October 2014 to collect distribution data on cetaceans, sharks, and their prey patches, as well as to collect abundance data using mark-recapture distance sampling methods. …
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Review of current asset maintenance in South African ports and recommendations for smart port maintenance
… consist of the eyeball inspection, aerial survey, instrument measure and diving inspection methods. The observations found that the current asset condition ratings for TNPA's waterside infrastructure are based on incomplete condition assessment methods which do not effectively assess …
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Population Estimation Procedures For Elk and Deer in the Black Hills, South Dakota: Development of a Sightability Model and Spotlight Survey
… underestimates of total counts when conducting aerial surveys for ungulates. The Black Hills of South Dakota are characterized by dense ponderosa pine (Pinus ponderosa), which affects sightability and accurate censusing of elk (Cervus elaphus). Few studies have evaluated aerial survey …
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Aerial Thermography in Archaeological Prospection: Applications & Processing
<p>Aerial thermography is one of the least utilized archaeological prospection methods, yet it has great potential for detecting anthropogenic anomalies. Thermal infrared radiation is absorbed and reemitted at varying rates by all objects on and within the ground depending upon their density, …
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Ecology of spring-migrating waterfowl within the lower Wabash River floodplain
Spring migration is an understudied, but important time for waterfowl as conditions faced during this period may affect reproductive success. Therefore, increasing our understanding of waterfowl ecology during spring is vital for maintaining desired population levels. The Midwestern United States …
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Conservation in a changing world: assessing the conservation status of an agriculturally adapted species, the blue crane
… describe the study areas. In Chapter 2, I use aerial survey data to estimate the Blue Crane population at 51000 (range 34000–68000) cranes, which is double the last conservative estimate in 2002. To assess population trends for Blue Crane over the last 30 years, I analyse two citizen science …
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Evaluation of Aerial Transect Surveys, Survival, and Movements of Pronghorns in Western South Dakota
We evaluated aerial transect surveys, survival, and movement of pronghorns (Antilocapra americana) from 2002-2005 in western South Dakota. Survival and cause-specific mortality of pronghorns (Antilocapra americana) have been well documented in several western states and Canadian provinces; however, …